How big is that A frame?
Looks like the one for land rovers, but the mounts at the back are a mystery, could be the floor mounts to fit them to a wrecker land rover. If it is it would make it very rare as only 3 I know of still exist, and 2 of them are in bandiana. And to me it looks mighty similar.
See pics on these pages
http://www.remlr.com/bandi-yard.html
http://www.remlr.com/lrprpics2a.html